Find the gain and phase characteristics of the maintaining amplifier.
A solid-state capacitive humidity sensor has a capacitance given by: C = 1.7 RH + 365pF where RH is the percentage relative humidity. The sensor has an associated parallel resistance of 100 kΩ. The sensor is incorporated into a feedback oscillator system with a pure inductance and a maintaining amplifier. The oscillator is to give […]
calculate the mean velocity of the gas at maximum flow rate
A pitot tube is used to measure the mean velocity of high pressure gas in a 0.15 m diameter pipe. At maximum flow rate the mean pitot differential pressure is 250 Pa. Use the data given below to: (a) calculate the mean velocity of the gas at maximum flow rate; (b) estimate the maximum mass […]
Calculate an accurate value for the differential pressure developed across the chosen Venturi, at maximum flow rate.
A Venturi is to be used to measure the flow rate of water in a pipe of diameter D = 0.20 m. The maximum flow rate of water is 1.5 × 103 m3 h−1, density is 103 kg m−3, and viscosity is 10−3 Pa s. Venturis with throat diameters of 0.10 m, 0.14 m and 0.18 m are available […]
sketch the form of the output signal when T = 2000 K.
A thermocouple has an e.m.f. of 5 mV when the hot junction is at 100 °C and the cold junction is at 0 °C. A thermopile consisting of 25 such thermocouples in series is used as a detector in a chopped, broadband pyrometer. When unchopped the power in the beam of radiation incident on the […]
calculate the power incident on the detector and the detector output current.
An optical fibre transmission system consists of a circular LED source, a 2-metre length of optical fibre and a circular PIN diode detector. Both the source and detector are positioned 100 µm from the ends of the fibre. Detailed data for the source, a glass fibre, a polymer fibre and the detector are given below. […]